was wondering if this is normal. i noticed copper deposits where the bolt and the barrel extension meet. shot 80 rounds on a new gun, bushmaster m4 is what i have. I'm new so forgive my ignorance. i did a search and found nothing.

If you didn't follow the proper break-in procedure, the barrel is gonna have some machining marks from where the rifling was cut, this can cause quite a bit of copper fouling. Did you do any sort of breaking-in of the barrel?

-Fred

__________________
"Breathe when you can, shoot when you should."
-Rob Leatham

Fire a round, clean the barrel. Do that for 25 rounds. Then start shooting 3 rounds in between cleanings until your up to 50 rounds, then do 5 rounds in between cleaning until your up to 100 rounds. The point of doing this is to try to get the burrs from machining the rifling out before any amount of copper is allowed to build up.

-Fred

__________________
"Breathe when you can, shoot when you should."
-Rob Leatham

Boresnakes are nice to take to the range and pull through every once in a while if your shooting a lot of rounds, but for a good cleaning, they're not the best. You'd be much better to get a good one piece rod with a free spinning handle, a copper brush, and a jag tip.

-Fred

__________________
"Breathe when you can, shoot when you should."
-Rob Leatham

I wouldn't think so, but there are others here that would be better to ask on something like that. JD, Slo, all you other guys who have way too much knowledge for one brain, what say you? Boresnake good for breaking in a barrel?

-Fred

__________________
"Breathe when you can, shoot when you should."
-Rob Leatham

If you didn't follow the proper break-in procedure, the barrel is gonna have some machining marks from where the rifling was cut, this can cause quite a bit of copper fouling. Did you do any sort of breaking-in of the barrel?

-Fred

shot 20 rounds one at a time not getting crazy, cleaned, shot 40 more, cleaned. shot 20 more now about to clean weapon.